How to make Jetty dynamically load “static” pages

Question

I am building Java web applications, and I hate the traditional \"code-compile-deploy-test\" cycle. I want to type in one tiny change, then see the result INSTANTLY, without

Answer 1

When using embedded Jetty 8.1.10, the 'useFileMappedBuffer=false' setting doesn't work any mode. I read the code for DefaultServlet, and it reads the property but it's not used for anything.

Instead I looked at where the buffer creation was configured, and found I could subclass SelectChannelConnector to get the benefits of Continuation, but without locking files on windows. If you simply use org.mortbay.jetty.bio.SocketConnector, then you will not get continuation support.

Here is my example:

import org.eclipse.jetty.io.Buffers.Type;
import org.eclipse.jetty.server.nio.SelectChannelConnector;

/**
 * A Connector that has the advantages NIO, but doesn't lock files in Windows by
 * avoiding memory mapped buffers.
 * 
 
 * It used to be that you could avoid this problem by setting "useFileMappedBuffer" as described in 
 * http://stackoverflow.com/questions/184312/how-to-make-jetty-dynamically-load-static-pages
 * However that approach doesn't seem to work in newer versions of jetty.
 * 
 * @author David Roussel
 * 
 */
public class SelectChannelConnectorNonLocking extends SelectChannelConnector {

    public SelectChannelConnectorNonLocking() {
        super();

        // Override AbstractNIOConnector and use all indirect buffers
        _buffers.setRequestBufferType(Type.INDIRECT);
        _buffers.setRequestHeaderType(Type.INDIRECT);
        _buffers.setResponseBufferType(Type.INDIRECT);
        _buffers.setResponseHeaderType(Type.INDIRECT);
    }
}

I've tested this for the locking problem, and it fixes the problem. I've not tested that it works with Continuations yet.